Finder system of high image magnification

Details Finder system of high image magnification Finder system of high image magnification

1985-06-28

1986-09-02

Gellner, Michael L.

354155, G03B 1302

Patent

active

046092722

ABSTRACT:
The disclosed finder system is constructed with three prisms. The first prism has a first entrance face, a first reflection face and a first exit face. The second prism has a second entrance face in contact with the first exit face, a second reflection face, and a second exit face. The third prism has a third entrance face in contact with the second exit face, a pair of roof-type reflection faces, a third reflection face in a common plane with the third entrance face, and a third exit face. Light entering through a photographic objective lens reflects from a quick return mirror to a focusing screen on which an image of an object forms. Light from the image reflects from the first reflection face to a direction parallel with an optical axis of the lens. The second reflection face then reflects the light progressively farther away from the optical axis to the pair of roof faces. The light then reflects progressively nearer the optical axis to the third reflection face, and then therefrom to an eyepiece for observing the finder image.

REFERENCES:
patent: 3541919 (1970-11-01), Weyrauch
patent: 4021823 (1977-05-01), Miyata

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